Update LICENSE.txt for APIM 4.5.0-alpha Release

[hisanhunais]

Purpose

• Update LICENSE.txt for APIM 4.5.0-alpha release
• Bumped the carbon-apimgt version
• Imported the old certificate required for the ExternalIDPJWTTestCase

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 17.52%. Comparing base (8c49bc4) to head (0f139dc).
Report is 65 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13684      +/-   ##
============================================
+ Coverage     11.96%   17.52%   +5.56%     
- Complexity      638      904     +266     
============================================
  Files           263      263              
  Lines         12160    12301     +141     
  Branches       1274     1284      +10     
============================================
+ Hits           1455     2156     +701     
+ Misses        10687    10116     -571     
- Partials         18       29      +11     

Flag	Coverage Δ
integration_tests	17.52% <ø> (+5.56%)	⬆️

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